In-app purchases now available in free apps

When iPhone OS 3.0 was first released, Apple stated that only paid apps would be able to take advantage of in-app purchases. This allowed developers to offer, say, the first 10 levels of a game, then to charge a little extra for additional levels. Now, free applications will be able to offer upgrades via in-app purchases, which will hopefully clear the App Store of the hundreds of lite titles of which I am personally not a fan.